Homeworks Backfil d 3.1 Four layers soil „for each 2.0 m 3.0m 7,- 14 kN/m stratum: z, =2m, y=14kN / m, 2,=lm, y=16kN/ m² , Z3=2m, 7 =17KN/m 2,-5m, 7 =22KN/m' .Below the fourth layer there is permable T-16 kN/m water table Tw9.8 kN/m 3.0 m sand Tat =17 kN/m sand soil. Cay Calculate: (i)total stress o ,pore water pressure u and effective stress o' (ii) plot distribution of stresses 5.0 m T22 kN/m' sand

Homeworks Backfil d 3.1 Four layers soil „for each 2.0 m 3.0m 7,- 14 kN/m stratum: z, =2m, y=14kN / m, 2,=lm, y=16kN/ m² , Z3=2m, 7 =17KN/m 2,-5m, 7 =22KN/m' .Below the fourth layer there is permable T-16 kN/m water table Tw9.8 kN/m 3.0 m sand Tat =17 kN/m sand soil. Cay Calculate: (i)total stress o ,pore water pressure u and effective stress o' (ii) plot distribution of stresses 5.0 m T22 kN/m' sand

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter13: Retaining Walls

Section: Chapter Questions

Problem 13.2P

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The sand layer shown is 2.5m thick. Beneath the sand layer is a 1.8m thick clay layer, underneath the clay layer is a solid rock. Water table is at depth of 0.9 m below the ground surface. SAND: Ymoist= 23KN/m3 ; Ysat= 21KN/m3 CLAY: Ysat= 23 KN/m3 ; LL= 42% e=0.7 A.) Compute the overburden pressure at mid-clay layer. B.) Find the maximum surface pressure without exceeding a 139.5mm settlement in clay layer if it is assumed to be normally consolidated. C.) If surface pressure is 70kpa and pre-consolidation pressure is 80kpa, find the settlement in clay layer.
A dense silt layer has the following properties: Void ratio = 0.76, SG= 2.59. Free ground water is 9.31m below the ground. Capillary action rise will reach 7.93m. The soil above capillary action rise is dry while within the zone, it is saturated at 53.13%. Determine the effective pressure (kPa) at a depth of 7.05m from the groind surface. Use stored value. Asnwer in 5 decimal places.
A 10 m depth of sand overlies a clay layer 8 m thick, below which is a further depth of sand. For the clay, mv =0 83m2 MN and cv =4 4m2 /year. Water table is at the surface level but is to be lowered permanently by 4 m, the initial lowering taking place over a period of 40 weeks. Calculate the final settlement due to consolidationof the clay, assuming no change in the weight of sand and the settlement 2 years after the start of lowering.
Shear Strentgh of the soil 2012
A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter length
(1b) Estimate the settlement of a 10 m square area loaded 1 m at 100 kN/ m3 placed 1 m below ground level with ground water at the level of the footing. The static cone resistance values for the sand deposit are as follows: G.L to 6 m = 8000kN/m3,6 -11 mm = 10,000kN/, below 11 m =12,000kN/m3.
:A strata of normally consolidated clay of thickness 10 ft is drained on one side only. It has a hydraulicconductivity of h = 1.863 x 10-8 in/sec and a coefficient of volume compressibility mv = 8.6 x 10-4 in2/lb. Determine theultimate value of the compression of the stratum by assuming a uniformly distributed load of 5250 lb/ft2 and alsodetermine the time required for 20 percent and 80 percent consolidation.
‘mormally consolidated clay given: 1S kKN/m® ateo=122 = 430 KN/m? ate=098 * 10° m/sec, Find: long in days will it take for a 3 m thick lsyer of the same drained both sides in the field to reach 50% consolidation? is settlement at 50% consolidation?
4.A layer of saturated clay is 10 m thick, the lower boundary being impermeable;an embankment is to be constructed above the clay. Determine the time requiredfor 90% consolidation of the clay layer. If 300 mm diameter sand drains at 4 mcentres in a square pattern were installed in the clay, in what time would the sameoverall degree of consolidation be reached? The coefficients of consolidation inthe vertical and horizontal directions, respectively, are 9.6 and 14.0 m^2/year.
An oil tank is to be sited on a soft alluvial deposit of clay. Below the soft clay is athick layer of stiff clay. It was decided that a circular embankment, 10 m diameter,with wick drains inserted into the soft clay would be constructed to preconsolidateit. The height of the embankment is 6 m and the unit weight of the soil comprisingthe embankment is 18 kN/m3. The following data are available: thickness of softclay = 7 m, ks = 1 × 10−10 m/s and Ch = 0.6 m2/yr. The desired degree ofconsolidation is 90% in 12 months. Determine the spacing of a square grid of thewick drains. Assume wick drain of size 100 mm × 3 mm and qw = 0.1 × 10−6 m3/s.The flow point distance is 4 m. Assume a half-closed system.
A layer of silty clay with a thickness of 10 m, sand with a thickness of 2m from the bottom and topit is located between. The groundwater level at the site is at the ground surface. In the fielda large area spread filling that acts on the ground surface and transfers stress of 100 kPait has a payload of. Unit volume weight of silty clay floor 18 kN / m3 and consolidationaccording to the coefficient of 0.3 m2/month, 50 months after the construction of the fill,find the silty sand layer in the middlehow many m will the water rise over the ground surface in a submerged piezometer pipe(take the unit volume weight of water 10 kN/m3)
3.A half-closed clay layer is 8 m thick and it can be assumed that cv ¼ ch. Verticalsand drains 300 mm in diameter, spaced at 3 m centres in a square pattern, areto be used to increase the rate of consolidation of the clay under the increasedvertical stress due to the construction of an embankment. Without sand drainsthe degree of consolidation at the time the embankment is due to come into usehas been calculated as 25%. What degree of consolidation would be reachedwith the sand drains at the same time?